"Zero-food children" are children between 6 and 23 months old who did not consume any milk, formula, or food in the last 24 hours. A Harvard study, published last month in the JAMA Network Open, a peer-reviewed journal, found that the prevalence of "zero-food children" is as high as 21 per cent in some countries. India had by far the largest number of zero-food children (6.7 million), which is almost half of all zero-food children in the 92 countries included in this study.